1.
notice; announcement; notification
A polite word for a notice, announcement, or piece of information communicated to someone. The honorific prefix お makes it suitable for formal and everyday use.
お知らせがあります。
I have an announcement.
大切なお知らせですので、よくお読みください。
This is an important notice, so please read it carefully.
休業のお知らせが店の入り口に貼ってあった。
A notice about the closure was posted at the entrance of the shop.
Ubiquitous in daily life — seen on websites, in emails, on signs, and in apps. Common patterns include ～のお知らせ (notice about ~) and お知らせいたします (we would like to inform you). Without the お prefix, 知らせ is a plain noun meaning news or information. The phrase 嬉しいお知らせ (happy news) and 悲しいお知らせ (sad news) are set expressions for delivering good or bad news.